<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div>test</div>
    <div>test2</div>
    <div>test3</div>
    <div>test3</div>
    <div>test4</div>
    <div>test5</div>
    <div>test6</div>
    <div>test6</div>
    <div>test6</div>
    <script>
        const obj = {
            uname: 123
        }

        const a = 1

        // obj instanceof Object

        // typeof obj

        // console.log(Object.prototype.toString(obj));
        console.log(Object.prototype.toString.call(a));
        console.log(Object.prototype.toString(a));
        // console.log(Object.prototype);
        console.log(Array.prototype);
    </script>
</body>

</html>